Question

当我拥有这种值时，我无法弄清楚如何从Json中获取数据

    2017-10-16 12:07:07
2017-10-16 12:07:07
2017-10-16 15:09:08
2017-10-16 15:09:08
2017-10-16 15:09:08
2017-10-16 15:09:08
2017-10-16 15:09:08
2017-10-16 18:11:09
2017-10-16 18:11:09
2017-11-29 17:26:57
2017-11-29 17:26:57
2017-11-29 17:26:57
2017-11-29 19:31:03

我的模板

 <div class="container">
      <div class="row">
          <div class="col-5">
               {% for date , block in block | groupby("date") %}
                 <div class="date">{{date |date }}</div>
              {% endfor %}

          </div>
      </div>
  </div>

在输出中我有

16 Oct
16 Oct
16 Oct
3 Nov
29 Nov
29 Nov

我想拥有

  16 Oct
  3 Nov
  29 Nov

也许是由于起初我从Json那里获取了所有数据，然后我将其分组，然后才使用dateFilter，但是我又应该如何以不同的方式归类呢？

我的gulpfile.js gulpfile

更新19.12.18

<div class="container">
       <div class="row">
            {% for date, block in block | groupby("date", "datefilter") %}
           <div class="col-5">
                <div class="date">
                        <h3> {{date}}</h3>
                        <p>amount {{block.length}}</p> // this line will give me amount of products for every day . 
                    </div>
              {% for id, block in block | groupby("id") %}
               <div class="id"> 
              {% for name, block in block | groupby("name") %}
                <p>{{name}} № {{ id }}  </p>
             </div>
               {% endfor %}
            {% endfor %}
           </div>

            {% endfor %}
       </div>
   </div>

example output

Answer 1

您的分组依据多次返回10月16日，因为该日期列出的时间值不同。如果您首先将日期格式设置为仅显示日期而不是时间，则分组依据应该起作用。您可以尝试仅提取dart部分-如果需要，可以将语言环境字符串替换为您的其他偏好设置。

var date = new Date("2017-11-29 19:31:03").toLocaleDateString("en-US");
console.log(date);

Answer 2

下面，我将标准groupby(prop)过滤器改进为groupby(prop, filter)。

在我的代码中，我使用roundDate代替date来表示日期舍入过滤器。

var nunjucks  = require('nunjucks');
var env = nunjucks.configure();

env.addFilter('roundDate', (e) => e.substring(0, 7));

env.addFilter('groupby', function (arr, prop, filter) {
    var res = {};
    var iterator = typeof prop == 'function' ? prop : (e) => e[prop];
    var func = this.env.filters[filter] || ((e) => e);
    arr.forEach(function (e, i) {
        var key = func(iterator(e, i));
        (res[key] || (res[key] = [])).push(e);
    })
    return res;
})

var data = [
    {date: "2017-10-16 12:07:07", value: "123"},
    {date: "2017-10-16 12:07:07", value: "123"},
    {date: "2017-10-16 15:09:08", value: "123"},
    {date: "2017-10-16 15:09:08", value: "123"},
    {date: "2017-10-16 15:09:08", value: "123"},
    {date: "2017-10-16 15:09:08", value: "123"},
    {date: "2017-10-16 15:09:08", value: "123"},
    {date: "2017-10-16 18:11:09", value: "123"},
    {date: "2017-10-16 18:11:09", value: "123"},
    {date: "2017-11-29 17:26:57", value: "123"},
    {date: "2017-11-29 17:26:57", value: "123"},
    {date: "2017-11-29 17:26:57", value: "123"},
    {date: "2017-11-29 19:31:03", value: "123"}
]

var res = env.renderString(`
    {% for a, items in data | groupby('date', 'roundDate') %}
       {{a}} {{items.length}}
    {% endfor %}
    `,
    {data}
);

console.log(res);

Answer 3

我确实是这样，对吗？

var manageEnvironment = function(environment) {

        environment.addFilter('datefilterq', dateFilter);
        dateFilter.setDefaultFormat('D MMM');
        environment.addFilter('groupby', function (arr, prop, filter) {
          var res = {};
          var iterator = typeof prop == 'function' ? prop : (e) => e[prop];
          var func = this.environment.filters[filter] || ((e) => e);
          arr.forEach(function (e, i) {
              var key = func(iterator(e, i));
              (res[key] || (res[key] = [])).push(e);
          })
          return res;
        })


}

如何使用具有不同值的nunjucks groupby？

3 个答案: